Mon Prof Augmenté
High Tide on Both Sides
Open to everyone until Tuesday, September 29
To keep it, print it while it is open.
Earth and the Moon both orbit a point that sits between them. The Moon’s pull stretches Earth’s oceans, so the water rises on the side facing the Moon and also on the side facing away.
In the picture
- Earth: the whole planet, turning as it swings around the shared centre
- The Moon: it orbits the same centre and pulls hardest on the ocean nearest to it
- The water hump on the side facing away from the Moon: water piles up there too
- The mark at the shared centre: the point both bodies circle around
Examples
- Water climbs the walls of a bucket when you swing it round in a circle.
- A ball on a string: your hand and the ball both circle a point between them.
Key takeaways
- The Moon pulls hardest on the ocean closest to it, and the water rises there.
- Because Earth spins, most coasts get two high tides each day.
Carry on in the app
Three questions on this lesson, to check the idea stuck. Free in the app while the lesson is in the free week.
At least one new illustrated lesson every weekday for your child’s year, with its quiz and a reminder at 6:15 pm.
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